Secret Army - Season 1 - Eps 11: A Question Of Loyalty
A British bomber crash lands somewhere outside Brussels, its entire crew is apparently dead. Kessler takes this as an opportunity to infiltrate Lifeline and assigns Ernst Stoller, an officer who was born and brought up in England, to substitute for one of the dead men. Meanwhile, Monique is becoming increasingly disillusioned with her life at the Candide and relationship with Albert, and finds herself letting her guard down when she becomes involved with Stoller as part of her Lifeline work.
About Secret Army

Title: Secret Army
First Air Date: 1977-09-07
Last Air Date: 1979-12-22
Status: Ended
Rating: 7.455/10 (from 11 votes)
Language: EN
Seasons: 4
Total Episodes: 43
Network: BBC One
Genres: Drama, War & Politics
Production Companies: BBC, Belgische Radio en Televisie
Synopsis
World War II drama about covert organisation Lifeline helping allied airmen escape after being shot down in occupied Europe, working with the Resistance and hiding from the Gestapo.
Cast

Bernard Hepton
Albert Foiret

Angela Richards
Monique Duchamps

Clifford Rose
Sturmbannführer Ludwig Kessler

Juliet Hammond-Hill
Natalie Chantrens